for my (Frank-Uwe) PC it like this:

xfreerdp /u:dill /d:win /size:1900x1100 /v:hasp116fud

or Beamline latop

xfreerdp /u:dill /d:win /size:1900x1100 /v:hasmp01

If there is a message like this:

The fingerprint for the host key sent by the remote host is


Please contact your system administrator.

Add correct host key in /home/p01user/.config/freerdp/known_hosts to get rid of this message.

Open the known_hosts file and delete the complete content. Do not forget to save the file.